scholarly journals Modeling of Sedimentation and Creaming in Suspensions and Pickering Emulsions

Fluids ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 186 ◽  
Author(s):  
Rajinder Pal
Keyword(s):  
Modeling And Simulation ◽  
Strong Influence ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Hindered Settling ◽  
Drift Flux ◽  
Three Phase ◽  
Oil Water ◽  
Single Droplets ◽  
Emulsions And Suspensions

Suspensions and emulsions are prone to kinetic instabilities of sedimentation and creaming, wherein the suspended particles and droplets fall or rise through a matrix fluid. It is important to understand and quantify sedimentation and creaming in such dispersed systems as they affect the shelf-life of products manufactured in the form of suspensions and emulsions. In this article, the unhindered and hindered settling/creaming behaviors of conventional emulsions and suspensions are first reviewed briefly. The available experimental data on settling/creaming of concentrated emulsions and suspensions are interpreted in terms of the drift flux theory. Modeling and simulation of nanoparticle-stabilized Pickering emulsions are carried out next. The presence of nanoparticles at the oil/water interface has a strong influence on the creaming/sedimentation behaviors of single droplets and swarm of droplets. Simulation results clearly demonstrate the strong influence of three-phase contact angle of nanoparticles present at the oil/water interface. This is the first definitive study dealing with modeling and simulation of unhindered and hindered creaming and sedimentation behaviors of nanoparticle-stabilized Pickering emulsions.

scholarly journals Preparation of Pickering emulsions through interfacial adsorption by soft cyclodextrin nanogels

2015 ◽  
Vol 11 ◽  
pp. 2355-2364 ◽  
Author(s):  
Shintaro Kawano ◽  
Toshiyuki Kida ◽  
Mitsuru Akashi ◽  
Hirofumi Sato ◽  
Motohiro Shizuma ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Adsorption Property ◽  
Building Blocks ◽  
Pickering Emulsion ◽  
Surface Active Property ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Surface Active ◽  
Oil Water ◽  
Interfacial Adsorption

Background: Emulsions stabilized by colloidal particles are known as Pickering emulsions. To date, soft microgel particles as well as inorganic and organic particles have been utilized as Pickering emulsifiers. Although cyclodextrin (CD) works as an attractive emulsion stabilizer through the formation of a CD–oil complex at the oil–water interface, a high concentration of CD is normally required. Our research focuses on an effective Pickering emulsifier based on a soft colloidal CD polymer (CD nanogel) with a unique surface-active property. Results: CD nanogels were prepared by crosslinking heptakis(2,6-di-O-methyl)-β-cyclodextrin with phenyl diisocyanate and subsequent immersion of the resulting polymer in water. A dynamic light scattering study shows that primary CD nanogels with 30–50 nm diameter assemble into larger CD nanogels with 120 nm diameter by an increase in the concentration of CD nanogel from 0.01 to 0.1 wt %. The CD nanogel has a surface-active property at the air–water interface, which reduces the surface tension of water. The CD nanogel works as an effective Pickering emulsion stabilizer even at a low concentration (0.1 wt %), forming stable oil-in-water emulsions through interfacial adsorption by the CD nanogels. Conclusion: Soft CD nanogel particles adsorb at the oil–water interface with an effective coverage by forming a strong interconnected network and form a stable Pickering emulsion. The adsorption property of CD nanogels on the droplet surface has great potential to become new microcapsule building blocks with porous surfaces. These microcapsules may act as stimuli-responsive nanocarriers and nanocontainers.

scholarly journals Designing biopolymer-coated Pickering emulsions to modulate in vitro gastric digestion: a static model study

2019 ◽  
Vol 10 (9) ◽  
pp. 5498-5509 ◽  
Author(s):  
Andrea Araiza-Calahorra ◽  
Anwesha Sarkar
Keyword(s):  
Static Model ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Gastric Digestion ◽  
Electrostatic Deposition ◽  
Model Study ◽  
Oil Water

The aim of this study was to restrict the degree of gastric destabilization of Pickering emulsions by using electrostatic deposition of a biopolymeric layer at the proteinaceous particle–laden oil–water interface.

Pickering-Type Emulsions of ODSA Sizing Agent Stabilized by Nano-Montmorillonite and N-Dodecane

2013 ◽  
Vol 319 ◽  
pp. 233-238 ◽  
Author(s):  
De Hai Yu ◽  
Zhao Yun Lin ◽  
You Ming Li
Keyword(s):  
Particle Concentration ◽  
Ph Value ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Paper Sizing ◽  
Oil In Water ◽  
Effects Of Ph ◽  
Oil Water ◽  
The Stability ◽  
Hydrolysis Resistance

Octadecenylsuccinic anhydride (ODSA) is an internal sizing agent used to hydrophobize paper and paper board in the process of papermaking. Nano-montmorillonite (MMT) particles and n-dodecane were used as the stabilizer to prepare stable ODSA Pickering emulsions. The effects of pH value, particle concentration, hydrolysis resistance and paper sizing performance of the ODSA Pickering emulsions were investigated. It was found that the stability of ODSA emulsions first increased and then decreased as the pH value decreased. More stable oil-in-water (o/w) emulsion can be made using 10 vol.% n-dodecane. Particle concentration was linked to the formation of particle films at oil–water interface, with a required minimum particle concentration of 1.5 wt.%. Paper sizing degree analysis indicated that the ODSA Pickering emulsions show increased hydrolysis resistance and good sizing performance.

scholarly journals Inner Rotation of Pickering Janus Emulsions

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3312
Author(s):  
Rajarshi Roy Raju ◽  
Joachim Koetz
Keyword(s):  
Magnetic Field ◽  
Gold Nanoparticles ◽  
Olive Oil ◽  
Silicone Oil ◽  
Core Shell ◽  
Water Interface ◽  
Pickering Emulsions ◽  
The Core ◽  
Oil Water ◽  
Inner Parts

Janus droplets were prepared by vortex mixing of three non-mixable liquids, i.e., olive oil, silicone oil and water, in the presence of gold nanoparticles (AuNPs) in the aqueous phase and magnetite nanoparticles (MNPs) in the olive oil. The resulting Pickering emulsions were stabilized by a red-colored AuNP layer at the olive oil/water interface and MNPs at the oil/oil interface. The core–shell droplets can be stimulated by an external magnetic field. Surprisingly, an inner rotation of the silicon droplet is observed when MNPs are fixed at the inner silicon droplet interface. This is the first example of a controlled movement of the inner parts of complex double emulsions by magnetic manipulation via interfacially confined magnetic nanoparticles.

Electrically Driven Motion of an Air Bubble on Hemispherical Oil/Water Interface by Three-Phase Boundary Reactions

Langmuir ◽  
2008 ◽  
Vol 24 (8) ◽  
pp. 4364-4369 ◽  
Author(s):  
Masanori Satoh ◽  
Koichi Aoki ◽  
Jingyuan Chen
Keyword(s):  
Phase Boundary ◽  
Water Interface ◽  
Air Bubble ◽  
Three Phase ◽  
Oil Water ◽  
Three Phase Boundary

scholarly journals Formulation, Stability and Physicochemical Properties of Pickering Emulsions: An Overview

2019 ◽  
Vol 11 (1) ◽  
pp. 41 ◽  
Author(s):  
Papa Mady Sy ◽  
Sidy Mouhamed Dieng ◽  
Mounibe Diarra
Keyword(s):  
Pharmaceutical Industry ◽  
Physicochemical Properties ◽  
Solid Particles ◽  
Water Interface ◽  
Pickering Emulsions ◽  
Internal Phase ◽  
Potential System ◽  
Oil Water ◽  
Formulation Stability ◽  
Targeted Release

This review work focuses mainly on the formulation, characterization, physicochemical properties and parameters of stability of emulsions stabilized by solid particles (Pickering emulsions). This concept of emulsions stabilized by particles strong knows a renewed interest in our days saw the benefits they present: good stability, protection of the environment, safety of users, types of particles etc. The adsorption of the solid particles at the oil-water interface is almost irreversible and strong, leading to the formation of a dense film, creating a barrier around the droplets and thus making the droplets very resistant to coalescence. Recently, the possibilities of application of emulsions stabilized by particles are considered in the pharmaceutical industry. This type of formulation may be a potential system of encapsulation of the active ingredients, allowing controlled and targeted release of the active ingredient from the internal phase.

Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

2020 ◽  
Author(s):  
Bingqing qian ◽  
Haiqiao Wang ◽  
Dong Wang ◽  
Hao-Bin Zhang ◽  
Jessica Wu ◽  
...  
Keyword(s):  
Porous Materials ◽  
Cellulose Nanocrystal ◽  
Water Interface ◽  
Oil Water

Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

1991 ◽  
Vol 56 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Takashi Kakiuchi ◽  
Mitsugi Senda
Keyword(s):  
Charge Transfer ◽  
Numerical Calculation ◽  
Supporting Electrolyte ◽  
Water Interface ◽  
Migration Effect ◽  
Ac Current ◽  
Stationary Interface ◽  
Oil Water ◽  
Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

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